Steam-engine.



PATENTEDMAR. 13, 1906.

J. LIN DBERG. STEAM ENGINE.

APPLICATION FILED IULY5. 1904.

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TTRNEY INI/Enron PATENTED MAR. 13, 1906. J. LINDBERG.

, STEAM ENGINE. APPLIcATIcN FILED JULY 5, 1904.

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C INVENTOH 5 Arron/v51 I Work together, and the steam acting altervInvrTEn ,sTATEs PATENT OEEIOE.

JOHAN LINDBERG, ,OE OROOKSTON, MINNESOTA.

STEAM-ENGINE.

lSpecification of Letters Patent.

l Patented. March 13, 1906.

-Applcationiiled J iily 5, 17904. Serial No. 215,320."

T0 @ZZ 'whom t may concern:

Be it known that I, JOHAN LINDBERG, -a citizen of the United States, residing at Crookston, in the county of Folkfand State of Minnesota, have .invented certain newand useful Improvements in Steam-Engines 5 and 4I'do hereby declare the following to be a full,

natelly at opposite sidesof the middle piston between it and the two outer ones.

f The object ofthe invention is to provide an improved engine of this character of simple compact construction andeflicient operation, with improved valve-gear, link-motion therefor, and adjusting-lever connections, together with other improved features of constructionand arrangement hereinafter pointed out.

In the accompanying drawings, Whichare to be taken as a part of this specification, I have illustrated a stationary horizontal -engine embodying my invention, which, however, is capable of-embodirnent in other forms and susceptible of 'modifications in details of construction and arrangement of parts. Without limiting myself, therefore, tothe particular construction 'shown the invention will be first fully describedwith reference -to said drawings and then deiined in the following claim.

In said drawings, Figure 1 is a central longitudinal vertical section through the cylinder, showing the istons and connections with the crank-sha t in elevation. Fig. 2 is acentral horizontal section through the cylinder. Fig. 3 is a vertical cross section through the guides for the cross-heads, showing the latter in elevation. Fig. 4 is a side elevation of the Whole engine. Fig. 5 is a top plan of the-same.

The engine-cylinder l isshown open-ended, which is suitable for stationary or indoor engines, though in locomotives it is desirable to close the ends by appropriate covers to keep out the dust.

In the cylinder are arranged three pistons 2 3 4. The front and rear pistons 2 and 4 are attached to a'piston--rod 5, which Works pistons 3 and 4 and 'causing Aof 'the cylinder.

middle vpiston 3. The intermediate lpiston `i's 'attached to a piston-rod 6, which Works through a stuffing-box in the rear piston 4. These pistonrods are shown arranged one above another, and they are connected at sliding cross-heads 7 to'pitmen or connectingrodsf8, which are connected to oppositelydisposed cranks `9 on theicrank-sha t or main engine-shaft 10.

The. piston-rods are preferably varranged as close together as possible, while the pitmen or connecting-rods are ynecessarily arranged somewhat farther apart to permit free passing of-one another, and the rear endsofthe connecting-rods are 'therefore curved inward to join the cross-heads 7. The upper cross-:head lreciprocate's in top and side guides 11, land lthe loWer-cross-head in bottom and side guides 12, as shown in Fig. 3.

Steam acts alternately at opposite sidesof the middle lpiston 8, 'iirst pushing apart pisand 4 to approach, and then pushing apart. pistons 2 and 8 to approach. The travel o each iston is of course less than one-third the wor ing length The intermediate piston may "travel one or tWo inches vmore than fthe outer pistons by properly lengthening its crank. c

The number 14 denotes fthe steam-chest, to which steam from la source Yof generation is admitted by the steam-pipe 315. Steamports 16 and 18 lead "from the vsteam-chest to opposite'sides'of the middle piston, each port being located about one-third the length of the cylinder from the end thereof. In this case the length of the cylinder is of course the distance between the eXtreme positions of the outer pistons. Adjacent to and located between the ports 16 18 are corresponding exhaust-ports 17 19,' connecting with the eX- haust-ppe 20. These ports are controlled by a slide-valve 21 of al length sufficient to include the ports. It has two chambers or cups therein, one adapted to connect ports 16 17 when the port 18 is uncovered and the other adapted to connect ports 1S 19 when the port 16 is uncovered, also an intermediate chamber into which steam is admitted through small ports or orifices. to balance the valve or counteract the pressure upon it and permit'the valve-stem 22 to move easily. In Fig. 2 the valve is shown in such position that the port 16 is opened or l through a stuffing-box in `the intermediate yor l tons`2 and 3, and thereby causing pistons "3 in the other end of the valve, so as to admit steam for expansion force between pistons 3 4 and to permit exhaust of steam from between pistons 2 3.-

The pistons are preferably formed wider at the tops than at the bottoms, the middlepiston slanting downward at opposite sides and the outer pistons slanting on their inner faces, which is for the purpose of establishing iioating pistons or utilizing the force of the steam in holding up the pistons and preventing an excess of friction on their under sides.

The slide-valve is operated and controlled to regulate the admission of steam and cutoff to the two sets of ports 16 17 and 18 19 by valve-gear including a link-motion adapted to obtain the accurate adjustments needed in this type of engine. This consists of two eccentrics 23 24 on the main shaft, having l their rods 25 26 pivotally connected to the upper and lower ends of a link 27, in which works a block 28, pivotally connected by rod 29 to the valve-stem 22. The slot inthe link is of course formed on an arc with the front end or pivot of rod 29 as a center. The link has a fixed location except in so far as it is permitted to oscillate and is sustained by an upright rocker-arm 30, to which it is pivoted, preferably at its middle. Y Said rocker-arm is shown in the form of two uprights inclosing the eccentric-rod 26 and embracing an eye in the middle of the link, through which and the upper ends of said uprights a pivot-pin 3l is inserted. The block 28 is vertically adjustable in the slotted link to change the motions of the valve by means of a lever arrangement, which as shown, comprises a bell-crank lever 32, fulcrumed in the upper end of an upright 33 between the link and the valvestem, having its front arm depending for manipulation or connection to a handle (not shown) and its rear arm longitudinal of the rod 29 and pivotally connected therewith near the block by link or links 34. Besides obtaining accurate adjustments the construction described is simple, compact, and keeps the mechanism low. The operation of the link-motion is of course apparent. The block 28 in the oscillating link receives its motion from the two eccentrics and comes under the dominance of that eccentric-rod whose end of the link it occupies.

I claim as my invention and desiie to secure by Letters Patent of the United States- A steam -engine having, in combination with the crank-shaft, three pistons in one cylinder, the two outer ones of which are attached to a piston-rod which slips through a stuHing-box in the middle one, while the middle piston is attached to a piston-rod which slips through a stufling-box in the rear piston, said rods arranged one above another and connected to sliding cross-heads, the upper one of which reciprocates in top and lateral guides while the lower one reciprocates in bottom and lateral guides, and pitmen connected to oppositely disposed cranks on the shaft and having inturned ends connected to said cross-heads, and means for admitting steam alternately between the middle and front pistons and middle and rear pistons, substantially as described.

In testimony whereof l aHix my signature in presence of two Witnesses.

JOHAN LINDBERG.

Witnesses EMIL HANSEN, ALBERT CHILGREN. 

